Evaporating apparatus.



A. A. DUNHAM.

EVAPORATING. APPARATUS.

APPLICATION men OCT. 24. ms.

Patnted Aug. 14,1917.

To eZZ whom a? may concern Be 1?; Known at? r'c l, 2.

nengo' Steie of ed or discorereci certs Improvements in Eve sorw of which the foilowing is a speci 1 erence being heel zhereii' to eccoinpe: in c iew, partly machine or apps ens inveniion. F :the air inle and L intei .o-r She cvhncln constructed. with isc cyiinder i 2 we hot water he saici acket he teci 1 a 9' 551011 reeled liqu d oeing e-C e. mi and dischrg f L. uh 'nown mann r The re icier 12 is partly enc \rovicied. inierlorlv 1 sn or rec it enters the hooci fr; it will be diverted in the concave sides of which are opposed to the direct-iris of movement of the passing sir cnrren'h so as to cause the air to pass ihrough ihe ch mher the hood in a, series of Whiris whicn will bring all portions of the air into contact with the liquid on the surface of the drying cylinder 12 and there expedite the T opereiion. It will d, 0 course. that the invention 7 e specific deflecting means 'eiis of construction of the M15 at the throat of the air pe may be varied widely.v within the esof mechanical skiii, without den this feetureof the invention.

id to he dried is contained in a l eptacie 23 located beneath the cy1- index 12 which dips inizo said pan or recepate "fiecie, anci to whichi o r liquid. is suppiied through a pipe *2 2. The pen or recepso low izhet the cylinder (ioes not reach it;

so that hen che machine is stopped chere neec'i be out little liquid remaining in the said can or receptacle.

in the operation of echines of this kind -he liquid is evaporated into a thin crust or fihn (hiring less than in complete rotation of the cylinder, and this crust or film of ma- "cerisi is removed from the drying cylinder means of 21 scraper 26 and is discharged a recepteeie as is usuai in the operation of machines of this kind. The evaporate-o. nmcerisii when discharged, however. is entirely dried but is stiii slightly moist.

for the purpose irying one this moist material the present improved formed by suction that will tend to lift or float the film being discharged into the receptacle 27, thereby bringing it into contact with the current of hot air coming from the deflector, and thus hastening the'final drying thereof. The deflector will be so arranged or adjusted as to secure the most advantageous lifting or floating of the dried film to efiect this final drying. The position of the valve 28 may be changed, by meanssaid hood will. be flaring soas to bev of proper.- form to admit and discharge the heated air to and from the chamber of said hood, as will be understood from Figs. 2.

and 3. In practice the air discharged from thepipe 18 will preferably be returned to the heating chamber from which the air entering at the pipe 17 is supplied.

Having thus described my inveiition I claim and desire to secure by Letters Patent:

1. In an evaporating apparatus, the co bination with a rotating drying cylinder, of a, hood partly surrounding said cylinder and provided internally with a series of curved deflecting wings, and means for supplying hot air to and discharging it from said cylinder, said curved wings being arranged so that their concave sides are opposed to the direction of movement of the passing air current.

2. In an evaporating apparatus, the combination with a rotating drying cylinder and a hood partly surrounding said cylinder and provided internally with curved deflecting wings, of air inlet and discharge pipes com- Inunicating with the chamber of said hood, the throat of the said inlet pipe being provided with means for diverting the incoming air current against said wings which are arranged so that their concave sides are opposed to the firection oi movement of the passing air current-F 3. in an evaporating hinatien a rotating apparatus, the comdrying cylinder and messes a hood partly surrounding said cylinder, of airinlet and discharge pipes. communicating with the chamber ofsaid hood, said inlet pipe having a hinged connection with said hood. Y i

4. .In an evaporating apparatus, the combination with a rotating drying cylinder and a hood partly surrounding said cylinder, of air inlet and discharge pipes communicating with the chamber of said hood, a scraper, located outside of said hood, for removing dried material from said cylinder, and a deflecting valve located between the di charge end of said hood and said scraper, and by means of which a portion of the heated air current passing through the chamber of said hood may be diverted so as to act, as hereinbefore described, on the material being removed ficom the said cylinder by said scraper.

5., In an bination with a rotating drying cylinder and a hood partly surrounding said cylinder, of air inlet and discharge 'pipes communicating with the chamber of said hood, a scraper for removing dried material fromsaid cylinder,

a deflecting valve located between the discharge end of said hood and said scraper, and by means of which a portion of the heated air current passing through the chamber of said hood may be diverted so as to act, as hereinbetore describtd, on the materiii il being removed from the said cylinder by said scraper, and a Valve, at or near the discharge end of said hood, for regulating the passage of air to said deflecting valve. 4 6. In an evaporating apparatus, the combination with a rotating drying cylinder, of a pan or receptacle located beneath said cylinder and into which said cylinder extends, said pan or receptacle having an inclined bottom with a pocket at its lowest part, and a doctor roll located at said pocket and serving to distribute the material, to be evaporated, on said cylinder evenly,.and .to take up liquid from said pocket and apply it to said cylinder when'the liquid in said pan or receptacle is so low as not to be reached by said cylinder,

In testimony whereof I 'ailix my signature.

REW A. DUNHAM.

evaporating apparatus, the comd 

